/*
 * Copyright (C) 2021 Christian Pierre MOMON <christian@momon.org>
 * 
 * This file is part of Logar, simple tool to manage http log files.
 * 
 * Logar is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * Logar is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with Logar.  If not, see <http://www.gnu.org/licenses/>.
 */
package fr.devinsy.logar.app.anonymizer;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;

import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * The Class AnonMapFile.
 */
public final class AnonMapFile
{
    private static Logger logger = LoggerFactory.getLogger(AnonMapFile.class);

    public static final String DEFAULT_CHARSET_NAME = "UTF-8";

    /**
     * Instantiates a new anon map file.
     */
    private AnonMapFile()
    {
    }

    /**
     * Load.
     *
     * @param source
     *            the source
     * @return the anon map
     */
    public static AnonMap load(final File source)
    {
        AnonMap result;

        result = new AnonMap();
        if ((source != null) && (source.exists()))
        {
            BufferedReader in = null;
            try
            {
                if (source.getName().endsWith(".gz"))
                {
                    in = new BufferedReader(new InputStreamReader(new GZIPInputStream(new FileInputStream(source))));
                }
                else
                {
                    in = new BufferedReader(new InputStreamReader(new FileInputStream(source), DEFAULT_CHARSET_NAME));
                }

                boolean ended = false;
                while (!ended)
                {
                    String key = in.readLine();
                    String value = in.readLine();

                    if (key == null)
                    {
                        ended = true;
                    }
                    else
                    {
                        result.put(key, value);
                    }
                }
            }
            catch (IOException exception)
            {
                exception.printStackTrace();
            }
            finally
            {
                IOUtils.closeQuietly(in);
            }

        }

        //
        return result;
    }

    /**
     * Save.
     *
     * @param source
     *            the source
     * @param map
     *            the map
     */
    public static void save(final File target, final AnonMap map)
    {
        if (target == null)
        {
            throw new IllegalArgumentException("Null parameter source.");
        }
        else if (map == null)
        {
            throw new IllegalArgumentException("Null parameter map.");
        }
        else
        {
            PrintWriter out = null;
            try
            {
                if (target.getName().endsWith(".gz"))
                {
                    out = new PrintWriter(new GZIPOutputStream(new FileOutputStream(target)));
                }
                else
                {
                    out = new PrintWriter(new FileOutputStream(target));
                }

                for (String key : map.getKeys())
                {
                    out.println(key);
                    out.println(map.get(key));
                }
            }
            catch (IOException exception)
            {
                System.err.println("Error with file [" + target.getAbsolutePath() + "]");
                exception.printStackTrace();
            }
            finally
            {
                IOUtils.closeQuietly(out);
            }
        }
    }
}